Okay, I'm a bit confused. I have a porch that is 21 ft. by 10 ft. The Southern Yellow Pine T & G flooring I will be using has about 3" exposed (minus the tongue) and is .58 cents per lineal foot.

I took the 21 ft. width, converted that to inches (252"), then divided that by 3" (the width of the board exposed). That gave me 84--the number of boards I will need (at 10 ft. in length each).

Now I'm really confused! I know the price of the wood at lineal feet, but don't know how many lineal feet the porch is. And knowing the square feet of the porch confusses me as my price is in lineal feet. HELP!